Could be the sending unit or a problem with the wiring if electrical.
Gauges that fluctuate back and forth could indicate a problem with the sensor or the gauge itself. It could be caused by a faulty connection, a malfunctioning sensor, or an electrical issue. It is important to have it checked by a mechanic to diagnose and fix the underlying problem.
Probably electrical, you may have accidentally unplugged a connector.
Do you have check engine light? If not you have an electrical problem within the speedometer assembly.
smoke alarms, thickness gauges, neutron sources, gamma and beta rays sources, etc.
Every time you hook up gauges, the line sets have to be purged thus reducing the quantity of the refrigerant. So to avoid unnecessary loss of refrigerant, visually inspect the equipment, you may not need to hook up gauges after all coz maybe its just an electrical problem.
Bad electrical connections.
they dont work
i had the exact same problem with our 91 voyager, i cleaned the battery terminals and the problem went away immediately
It means that you have a low reading on one of the gauges and you need to address the problem.
You may have an electrical problem. need a professional tech to look at it. I just found out that it is a gauge cluster problem. This is not the first time I heard this as I did call the dealership and explained to the mechanic what was happening, he said and the same thing. It is not uncommon for this problem in trailblazers. If the gauges are not working, then your battery is not getting charged up.
The coldness